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2 DISTINCT TRANSITIONS IN ULTRAFAST SOLID LIQUID-PHASE TRANSFORMATIONS OF GAAS

被引：78
作者：
SOKOLOWSKITINTEN, K
SCHULZ, H
BIALKOWSKI, J
VONDERLINDE, D
机构：
[1] Institut für Laser- und Plasmaphysik, Universität-GH-Essen, Essen 1
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1991年 / 53卷 / 03期
关键词：
D O I：
10.1007/BF00324257
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Femtosecond-laser-induced changes of the optical reflectivity and the reflected second harmonic are measured over a wide range of times and laser fluences. Changes of the linear and nonlinear optical properties suggestive of a, transition to a metallic state have been observed. For relatively low fluences these changes take tens of picoseconds to develop. For higher fluences the transition takes place in just a few hundred femtoseconds. Our data suggest that, depending on the laser excitation conditions, two distinctly different types of phase transformations are observed.
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页码：227 / 234
页数：8
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